TOPIC: Selection Limit not working properly

I have a live event that has a field with five checkbox registration options. Three of the options have selection limits, and two do not.

Two of the three options with limits have sold out, and are ghosted on the registration page, which is great.

My problem is that the first option with limits has NOT sold out...I have one more space, but it is still ghosted out and may not be selected. I tried upping the selection limits by one or a few...even increasing it to ten times what is currently registered, and the check box still will not become available.

I have also set the selection limit for that box to zero, and it still is not available.

I hoping someone can help.

Scott